Biogeochemical consequences of nonvertical methane transport in sediment offshore northwestern Svalbard
A site at the gas hydrate stability limit was investigated offshore northwestern Svalbard to study methane transport in sediment. The site was characterized by chemosynthetic communities (sulfur bacteria mats, tubeworms) and gas venting. Sediments were sampled with in‐situ porewater collectors and b...
Published in: | Journal of Geophysical Research: Biogeosciences |
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Main Authors: | , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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AGU (American Geophysical Union)
2020
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Online Access: | https://oceanrep.geomar.de/id/eprint/49197/ https://oceanrep.geomar.de/id/eprint/49197/2/jgrg21620-sup-0001-2019jg005371-si.docx https://oceanrep.geomar.de/id/eprint/49197/3/jgrg21620-sup-0002-2019jg005371-ms01.avi https://oceanrep.geomar.de/id/eprint/49197/10/2019JG005371.pdf https://doi.org/10.1029/2019JG005371 |
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ftoceanrep:oai:oceanrep.geomar.de:49197 2023-05-15T18:29:45+02:00 Biogeochemical consequences of nonvertical methane transport in sediment offshore northwestern Svalbard Treude, Tina Krause, Stefan Steinle, L. Burwicz, Ewa B. Hamdan, L. J. Niemann, H. Feseker, T. Liebetrau, Volker Krastel, Sebastian Berndt, Christian 2020-03-01 text video https://oceanrep.geomar.de/id/eprint/49197/ https://oceanrep.geomar.de/id/eprint/49197/2/jgrg21620-sup-0001-2019jg005371-si.docx https://oceanrep.geomar.de/id/eprint/49197/3/jgrg21620-sup-0002-2019jg005371-ms01.avi https://oceanrep.geomar.de/id/eprint/49197/10/2019JG005371.pdf https://doi.org/10.1029/2019JG005371 en eng AGU (American Geophysical Union) Wiley https://oceanrep.geomar.de/id/eprint/49197/2/jgrg21620-sup-0001-2019jg005371-si.docx https://oceanrep.geomar.de/id/eprint/49197/3/jgrg21620-sup-0002-2019jg005371-ms01.avi https://oceanrep.geomar.de/id/eprint/49197/10/2019JG005371.pdf Treude, T. , Krause, S. , Steinle, L. , Burwicz, E. B. , Hamdan, L. J., Niemann, H. , Feseker, T., Liebetrau, V., Krastel, S. and Berndt, C. (2020) Biogeochemical consequences of nonvertical methane transport in sediment offshore northwestern Svalbard. Open Access Journal of Geophysical Research: Biogeosciences, 125 (art. no. e2019JG005371). DOI 10.1029/2019JG005371 <https://doi.org/10.1029/2019JG005371>. doi:10.1029/2019JG005371 info:eu-repo/semantics/openAccess Article PeerReviewed 2020 ftoceanrep https://doi.org/10.1029/2019JG005371 2023-04-07T15:49:49Z A site at the gas hydrate stability limit was investigated offshore northwestern Svalbard to study methane transport in sediment. The site was characterized by chemosynthetic communities (sulfur bacteria mats, tubeworms) and gas venting. Sediments were sampled with in‐situ porewater collectors and by gravity coring followed by analyses of porewater constituents, sediment and carbonate geochemistry, and microbial activity, taxonomy, and lipid biomarkers. Sulfide and alkalinity concentrations showed concentration maxima in near‐surface sediments at the bacterial mat and deeper maxima at the gas vent site. Sediments at the periphery of the chemosynthetic field were characterized by two sulfate‐methane transition zones (SMTZ) at ~204 and 45 cm depth, where activity maxima of microbial anaerobic oxidation of methane (AOM) with sulfate were found. Amplicon sequencing and lipid biomarker indicate that AOM at the SMTZs was mediated by ANME‐1 archaea. A 1D numerical transport reaction model suggests that the deeper SMTZ‐1 formed on centennial scale by vertical advection of methane, while the shallower SMTZ‐2 could only be reproduced by non‐vertical methane injections starting on decadal scale. Model results were supported by age distribution of authigenic carbonates, showing youngest carbonates within SMTZ‐2. We propose that non‐vertical methane injection was induced by increasing blockage of vertical transport or formation of sediment fractures. Our study further suggests that the methanotrophic response to the non‐vertical methane injection was commensurate with new methane supply. This finding provides new information about for the response time and efficiency of the benthic methane filter in environments with fluctuating methane transport. Article in Journal/Newspaper Svalbard OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Svalbard Journal of Geophysical Research: Biogeosciences 125 3 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
A site at the gas hydrate stability limit was investigated offshore northwestern Svalbard to study methane transport in sediment. The site was characterized by chemosynthetic communities (sulfur bacteria mats, tubeworms) and gas venting. Sediments were sampled with in‐situ porewater collectors and by gravity coring followed by analyses of porewater constituents, sediment and carbonate geochemistry, and microbial activity, taxonomy, and lipid biomarkers. Sulfide and alkalinity concentrations showed concentration maxima in near‐surface sediments at the bacterial mat and deeper maxima at the gas vent site. Sediments at the periphery of the chemosynthetic field were characterized by two sulfate‐methane transition zones (SMTZ) at ~204 and 45 cm depth, where activity maxima of microbial anaerobic oxidation of methane (AOM) with sulfate were found. Amplicon sequencing and lipid biomarker indicate that AOM at the SMTZs was mediated by ANME‐1 archaea. A 1D numerical transport reaction model suggests that the deeper SMTZ‐1 formed on centennial scale by vertical advection of methane, while the shallower SMTZ‐2 could only be reproduced by non‐vertical methane injections starting on decadal scale. Model results were supported by age distribution of authigenic carbonates, showing youngest carbonates within SMTZ‐2. We propose that non‐vertical methane injection was induced by increasing blockage of vertical transport or formation of sediment fractures. Our study further suggests that the methanotrophic response to the non‐vertical methane injection was commensurate with new methane supply. This finding provides new information about for the response time and efficiency of the benthic methane filter in environments with fluctuating methane transport. |
format |
Article in Journal/Newspaper |
author |
Treude, Tina Krause, Stefan Steinle, L. Burwicz, Ewa B. Hamdan, L. J. Niemann, H. Feseker, T. Liebetrau, Volker Krastel, Sebastian Berndt, Christian |
spellingShingle |
Treude, Tina Krause, Stefan Steinle, L. Burwicz, Ewa B. Hamdan, L. J. Niemann, H. Feseker, T. Liebetrau, Volker Krastel, Sebastian Berndt, Christian Biogeochemical consequences of nonvertical methane transport in sediment offshore northwestern Svalbard |
author_facet |
Treude, Tina Krause, Stefan Steinle, L. Burwicz, Ewa B. Hamdan, L. J. Niemann, H. Feseker, T. Liebetrau, Volker Krastel, Sebastian Berndt, Christian |
author_sort |
Treude, Tina |
title |
Biogeochemical consequences of nonvertical methane transport in sediment offshore northwestern Svalbard |
title_short |
Biogeochemical consequences of nonvertical methane transport in sediment offshore northwestern Svalbard |
title_full |
Biogeochemical consequences of nonvertical methane transport in sediment offshore northwestern Svalbard |
title_fullStr |
Biogeochemical consequences of nonvertical methane transport in sediment offshore northwestern Svalbard |
title_full_unstemmed |
Biogeochemical consequences of nonvertical methane transport in sediment offshore northwestern Svalbard |
title_sort |
biogeochemical consequences of nonvertical methane transport in sediment offshore northwestern svalbard |
publisher |
AGU (American Geophysical Union) |
publishDate |
2020 |
url |
https://oceanrep.geomar.de/id/eprint/49197/ https://oceanrep.geomar.de/id/eprint/49197/2/jgrg21620-sup-0001-2019jg005371-si.docx https://oceanrep.geomar.de/id/eprint/49197/3/jgrg21620-sup-0002-2019jg005371-ms01.avi https://oceanrep.geomar.de/id/eprint/49197/10/2019JG005371.pdf https://doi.org/10.1029/2019JG005371 |
geographic |
Svalbard |
geographic_facet |
Svalbard |
genre |
Svalbard |
genre_facet |
Svalbard |
op_relation |
https://oceanrep.geomar.de/id/eprint/49197/2/jgrg21620-sup-0001-2019jg005371-si.docx https://oceanrep.geomar.de/id/eprint/49197/3/jgrg21620-sup-0002-2019jg005371-ms01.avi https://oceanrep.geomar.de/id/eprint/49197/10/2019JG005371.pdf Treude, T. , Krause, S. , Steinle, L. , Burwicz, E. B. , Hamdan, L. J., Niemann, H. , Feseker, T., Liebetrau, V., Krastel, S. and Berndt, C. (2020) Biogeochemical consequences of nonvertical methane transport in sediment offshore northwestern Svalbard. Open Access Journal of Geophysical Research: Biogeosciences, 125 (art. no. e2019JG005371). DOI 10.1029/2019JG005371 <https://doi.org/10.1029/2019JG005371>. doi:10.1029/2019JG005371 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2019JG005371 |
container_title |
Journal of Geophysical Research: Biogeosciences |
container_volume |
125 |
container_issue |
3 |
_version_ |
1766213100798738432 |